28 March 2003 Colorimetric characterization of projection displays using a digital colorimetric camera
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The need for color consistency throughout an imaging system has made color management an important field. A key to successful color management is to find adequate models for colorimetric characterization of devices, giving accurate mappings between the color spaces of individual devices and a device-independent color space. Due to the considerable spatial non-uniformity typically found with projection displays, a conventional model for colorimetric characterization is only valid at the position the characterization data was measured. In this study a colorimetric camera is introduced and evaluated as a supplement to the traditional and evaluated as a supplement to the traditional spectroradiometer. Inspired by the fact that we are now able to conveniently collect colorimetric data with high spatial resolution, we propose a new global characterization model which enables consistent color reproduction over the entire display. The performance of the global characterization was evaluated based on two criteria, the absolute characterization accuracy of a color displayed at the center and the relative accuracy across the display. The absolute accuracy was tested by displaying 20 random color patches at the center and gave an average color difference ΔEab= 3.66 between measured and predicted color. The relative accuracy across the display was tested by using uniform tristimulus values as input, and measuring non-uniformities in the displayed images. The average color difference across the display for a set of 12 test images was ΔE = 2.59. Applications for the proposed global characterization include high quality image display for commerce, design and simulation applications, and particularly stitching of multiple projector images.
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Jon Yngve Hardeberg, Jon Yngve Hardeberg, Lars Seime, Lars Seime, Trond Skogstad, Trond Skogstad, "Colorimetric characterization of projection displays using a digital colorimetric camera", Proc. SPIE 5002, Projection Displays IX, (28 March 2003); doi: 10.1117/12.473865; https://doi.org/10.1117/12.473865

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